the pentagon says the attack occurred last thursday in international air space over the persian gulf. >> unarmed, unmanned, u.s. mq1 aircraft conducting routine surveillance over the iranian gulf was intercepted by iranian su-25 aircraft and was fired upon with guns. >> little says the iranian jets fired at least twice at the drone but failed to hit it. the u.s. believes the pilots intended to shoot the aircraft down. he says the u.s. uses drones for reconnaissance in accordance with international rules and that the country will continue to conduct such flights. the obama administration has intensified its surveillance of iran. it has also stepped up economic sanctions. the actions are part of efforts to pressure iran to suspend its nuclear development program. analysts say the attack on the drone reflects iran's growing frustration over the u.s. actions. >>> the man who shot u.s. congresswoman gabrielle giffords in the head and killed six people has been sentenced to life in prison. the shooting rampage took place in january last year in the state of arizona. jared lee loughner shot